This ad sounded quite intriguing to me until I found out what they were really selling.

"Attention sci-fi addicts and kids of all ages. Now you too can have your very own Photon Emitter Module. Yes, it's true! For only $39.99, you can impress your friends when you show off your Photon Emitter. It's safer than a laser and easy to install in any home. The amazing Photon Emitter Module converts electrons into photons and safely releases them for your viewing pleasure. To get yours, just send $39.99 to ..."

What are they really selling?

Hint

You probably already have a dozen or more of these in your home already.Hide